The majority of polyurethanes are crosslinked thermoset polymers, which cannot be recycled by melting and extrusion processes without excessive degradation. Sev eral recycling techniques for polyurethanes have been described in technical and scientific literature and are used industrially, such as rebonding of flexible foam, regrind and hot stamping of Reinforced Reaction Injection Molding (RRIM) and glycolysis of rigid foams.
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H.R. Van Der Wal (1994) studied this question.
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